├── docs
    └── readme-example.png
├── java-class-quick-look.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── louisdhauwe.xcuserdatad
    │       └── xcschemes
    │           ├── java-class-quick-look.xcscheme
    │           └── xcschememanagement.plist
├── java-class-quick-look
    ├── GeneratePreviewForURL.m
    ├── GenerateThumbnailForURL.c
    ├── Info.plist
    └── main.c
└── readme.md


/docs/readme-example.png:
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https://raw.githubusercontent.com/louisdh/java-class-quick-look/a3558cd35b67f0c4d69b213d24748490b14af373/docs/readme-example.png


--------------------------------------------------------------------------------
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/java-class-quick-look/GeneratePreviewForURL.m:
--------------------------------------------------------------------------------
 1 | #include <CoreFoundation/CoreFoundation.h>
 2 | #include <CoreServices/CoreServices.h>
 3 | #include <QuickLook/QuickLook.h>
 4 | 
 5 | #import <Foundation/Foundation.h>
 6 | #import <Cocoa/Cocoa.h>
 7 | 
 8 | OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options);
 9 | void CancelPreviewGeneration(void *thisInterface, QLPreviewRequestRef preview);
10 | 
11 | /* -----------------------------------------------------------------------------
12 |    Generate a preview for file
13 | 
14 |    This function's job is to create preview for designated file
15 |    ----------------------------------------------------------------------------- */
16 | 
17 | OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options) {
18 | 	
19 | 	@autoreleasepool {
20 | 		
21 | 		if (QLPreviewRequestIsCancelled(preview)) {
22 | 			return noErr;
23 | 		}
24 | 		
25 | 		NSString *fileName = (__bridge NSString *)CFURLGetString(url);
26 | 		
27 | 		NSPipe *pipe = [NSPipe pipe];
28 | 		NSFileHandle *file = pipe.fileHandleForReading;
29 | 		
30 | 		NSTask *task = [[NSTask alloc] init];
31 | 		task.launchPath = @"/usr/bin/javap";
32 | 		task.arguments = @[@"-c", fileName];
33 | 		task.standardOutput = pipe;
34 | 		
35 | 		[task launch];
36 | 		
37 | 		NSData *data = [file readDataToEndOfFile];
38 | 		[file closeFile];
39 | 		
40 | 		NSString *grepOutput = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
41 | 		
42 | 		NSMutableString *text = [[NSMutableString alloc] initWithString:grepOutput];
43 | 		
44 | 		NSDictionary *properties = @{
45 | 			(__bridge NSString *)kQLPreviewPropertyTextEncodingNameKey : @"UTF-8",
46 | 			(__bridge NSString *)kQLPreviewPropertyMIMETypeKey : @"text/plain" };
47 | 		
48 | 		QLPreviewRequestSetDataRepresentation(preview, (__bridge CFDataRef)[text dataUsingEncoding:NSUTF8StringEncoding], kUTTypePlainText, (__bridge CFDictionaryRef)properties);
49 | 		
50 | 		return noErr;
51 | 	}
52 | 	
53 |     return noErr;
54 | }
55 | 
56 | void CancelPreviewGeneration(void *thisInterface, QLPreviewRequestRef preview) {
57 | 	
58 |     // Implement only if supported
59 | }
60 | 


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/java-class-quick-look/GenerateThumbnailForURL.c:
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 1 | #include <CoreFoundation/CoreFoundation.h>
 2 | #include <CoreServices/CoreServices.h>
 3 | #include <QuickLook/QuickLook.h>
 4 | 
 5 | OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize);
 6 | void CancelThumbnailGeneration(void *thisInterface, QLThumbnailRequestRef thumbnail);
 7 | 
 8 | /* -----------------------------------------------------------------------------
 9 |     Generate a thumbnail for file
10 | 
11 |    This function's job is to create thumbnail for designated file as fast as possible
12 |    ----------------------------------------------------------------------------- */
13 | 
14 | OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize)
15 | {
16 |     // To complete your generator please implement the function GenerateThumbnailForURL in GenerateThumbnailForURL.c
17 |     return noErr;
18 | }
19 | 
20 | void CancelThumbnailGeneration(void *thisInterface, QLThumbnailRequestRef thumbnail)
21 | {
22 |     // Implement only if supported
23 | }
24 | 


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/java-class-quick-look/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleDocumentTypes</key>
 8 | 	<array>
 9 | 		<dict>
10 | 			<key>CFBundleTypeRole</key>
11 | 			<string>QLGenerator</string>
12 | 			<key>LSItemContentTypes</key>
13 | 			<array>
14 | 				<string>com.sun.java-class</string>
15 | 			</array>
16 | 		</dict>
17 | 	</array>
18 | 	<key>CFBundleExecutable</key>
19 | 	<string>$(EXECUTABLE_NAME)</string>
20 | 	<key>CFBundleIdentifier</key>
21 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
22 | 	<key>CFBundleInfoDictionaryVersion</key>
23 | 	<string>6.0</string>
24 | 	<key>CFBundleName</key>
25 | 	<string>$(PRODUCT_NAME)</string>
26 | 	<key>CFBundleShortVersionString</key>
27 | 	<string>1.0</string>
28 | 	<key>CFBundleVersion</key>
29 | 	<string>1</string>
30 | 	<key>CFPlugInDynamicRegisterFunction</key>
31 | 	<string></string>
32 | 	<key>CFPlugInDynamicRegistration</key>
33 | 	<string>NO</string>
34 | 	<key>CFPlugInFactories</key>
35 | 	<dict>
36 | 		<key>4CCAD7B6-F74F-4BDB-A0A1-46414DE26A03</key>
37 | 		<string>QuickLookGeneratorPluginFactory</string>
38 | 	</dict>
39 | 	<key>CFPlugInTypes</key>
40 | 	<dict>
41 | 		<key>5E2D9680-5022-40FA-B806-43349622E5B9</key>
42 | 		<array>
43 | 			<string>4CCAD7B6-F74F-4BDB-A0A1-46414DE26A03</string>
44 | 		</array>
45 | 	</dict>
46 | 	<key>CFPlugInUnloadFunction</key>
47 | 	<string></string>
48 | 	<key>NSHumanReadableCopyright</key>
49 | 	<string>Copyright © 2017 Silver Fox. All rights reserved.</string>
50 | 	<key>QLNeedsToBeRunInMainThread</key>
51 | 	<false/>
52 | 	<key>QLPreviewHeight</key>
53 | 	<real>600</real>
54 | 	<key>QLPreviewWidth</key>
55 | 	<real>800</real>
56 | 	<key>QLSupportsConcurrentRequests</key>
57 | 	<false/>
58 | 	<key>QLThumbnailMinimumSize</key>
59 | 	<real>17</real>
60 | </dict>
61 | </plist>
62 | 


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/java-class-quick-look/main.c:
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  1 | //==============================================================================
  2 | //
  3 | //  DO NO MODIFY THE CONTENT OF THIS FILE
  4 | //
  5 | //  This file contains the generic CFPlug-in code necessary for your generator
  6 | //  To complete your generator implement the function in GenerateThumbnailForURL/GeneratePreviewForURL.c
  7 | //
  8 | //==============================================================================
  9 | 
 10 | 
 11 | 
 12 | 
 13 | 
 14 | 
 15 | #include <CoreFoundation/CoreFoundation.h>
 16 | #include <CoreFoundation/CFPlugInCOM.h>
 17 | #include <CoreServices/CoreServices.h>
 18 | #include <QuickLook/QuickLook.h>
 19 | 
 20 | // -----------------------------------------------------------------------------
 21 | //  constants
 22 | // -----------------------------------------------------------------------------
 23 | 
 24 | // Don't modify this line
 25 | #define PLUGIN_ID "4CCAD7B6-F74F-4BDB-A0A1-46414DE26A03"
 26 | 
 27 | //
 28 | // Below is the generic glue code for all plug-ins.
 29 | //
 30 | // You should not have to modify this code aside from changing
 31 | // names if you decide to change the names defined in the Info.plist
 32 | //
 33 | 
 34 | 
 35 | // -----------------------------------------------------------------------------
 36 | //  typedefs
 37 | // -----------------------------------------------------------------------------
 38 | 
 39 | // The thumbnail generation function to be implemented in GenerateThumbnailForURL.c
 40 | OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize);
 41 | void CancelThumbnailGeneration(void* thisInterface, QLThumbnailRequestRef thumbnail);
 42 | 
 43 | // The preview generation function to be implemented in GeneratePreviewForURL.c
 44 | OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options);
 45 | void CancelPreviewGeneration(void *thisInterface, QLPreviewRequestRef preview);
 46 | 
 47 | // The layout for an instance of QuickLookGeneratorPlugIn
 48 | typedef struct __QuickLookGeneratorPluginType
 49 | {
 50 |     void        *conduitInterface;
 51 |     CFUUIDRef    factoryID;
 52 |     UInt32       refCount;
 53 | } QuickLookGeneratorPluginType;
 54 | 
 55 | // -----------------------------------------------------------------------------
 56 | //  prototypes
 57 | // -----------------------------------------------------------------------------
 58 | //  Forward declaration for the IUnknown implementation.
 59 | //
 60 | 
 61 | QuickLookGeneratorPluginType  *AllocQuickLookGeneratorPluginType(CFUUIDRef inFactoryID);
 62 | void                         DeallocQuickLookGeneratorPluginType(QuickLookGeneratorPluginType *thisInstance);
 63 | HRESULT                      QuickLookGeneratorQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv);
 64 | void                        *QuickLookGeneratorPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID);
 65 | ULONG                        QuickLookGeneratorPluginAddRef(void *thisInstance);
 66 | ULONG                        QuickLookGeneratorPluginRelease(void *thisInstance);
 67 | 
 68 | // -----------------------------------------------------------------------------
 69 | //  myInterfaceFtbl  definition
 70 | // -----------------------------------------------------------------------------
 71 | //  The QLGeneratorInterfaceStruct function table.
 72 | //
 73 | static QLGeneratorInterfaceStruct myInterfaceFtbl = {
 74 |     NULL,
 75 |     QuickLookGeneratorQueryInterface,
 76 |     QuickLookGeneratorPluginAddRef,
 77 |     QuickLookGeneratorPluginRelease,
 78 |     NULL,
 79 |     NULL,
 80 |     NULL,
 81 |     NULL
 82 | };
 83 | 
 84 | 
 85 | // -----------------------------------------------------------------------------
 86 | //  AllocQuickLookGeneratorPluginType
 87 | // -----------------------------------------------------------------------------
 88 | //  Utility function that allocates a new instance.
 89 | //      You can do some initial setup for the generator here if you wish
 90 | //      like allocating globals etc...
 91 | //
 92 | QuickLookGeneratorPluginType *AllocQuickLookGeneratorPluginType(CFUUIDRef inFactoryID)
 93 | {
 94 |     QuickLookGeneratorPluginType *theNewInstance;
 95 | 
 96 |     theNewInstance = (QuickLookGeneratorPluginType *)malloc(sizeof(QuickLookGeneratorPluginType));
 97 |     memset(theNewInstance,0,sizeof(QuickLookGeneratorPluginType));
 98 | 
 99 |         /* Point to the function table Malloc enough to store the stuff and copy the filler from myInterfaceFtbl over */
100 |     theNewInstance->conduitInterface = malloc(sizeof(QLGeneratorInterfaceStruct));
101 |     memcpy(theNewInstance->conduitInterface,&myInterfaceFtbl,sizeof(QLGeneratorInterfaceStruct));
102 | 
103 |         /*  Retain and keep an open instance refcount for each factory. */
104 |     theNewInstance->factoryID = CFRetain(inFactoryID);
105 |     CFPlugInAddInstanceForFactory(inFactoryID);
106 | 
107 |         /* This function returns the IUnknown interface so set the refCount to one. */
108 |     theNewInstance->refCount = 1;
109 |     return theNewInstance;
110 | }
111 | 
112 | // -----------------------------------------------------------------------------
113 | //  DeallocQuickLookGeneratorPluginType
114 | // -----------------------------------------------------------------------------
115 | //  Utility function that deallocates the instance when
116 | //  the refCount goes to zero.
117 | //      In the current implementation generator interfaces are never deallocated
118 | //      but implement this as this might change in the future
119 | //
120 | void DeallocQuickLookGeneratorPluginType(QuickLookGeneratorPluginType *thisInstance)
121 | {
122 |     CFUUIDRef theFactoryID;
123 | 
124 |     theFactoryID = thisInstance->factoryID;
125 |         /* Free the conduitInterface table up */
126 |     free(thisInstance->conduitInterface);
127 | 
128 |         /* Free the instance structure */
129 |     free(thisInstance);
130 |     if (theFactoryID){
131 |         CFPlugInRemoveInstanceForFactory(theFactoryID);
132 |         CFRelease(theFactoryID);
133 |     }
134 | }
135 | 
136 | // -----------------------------------------------------------------------------
137 | //  QuickLookGeneratorQueryInterface
138 | // -----------------------------------------------------------------------------
139 | //  Implementation of the IUnknown QueryInterface function.
140 | //
141 | HRESULT QuickLookGeneratorQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv)
142 | {
143 |     CFUUIDRef interfaceID;
144 | 
145 |     interfaceID = CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault,iid);
146 | 
147 |     if (CFEqual(interfaceID,kQLGeneratorCallbacksInterfaceID)){
148 |             /* If the Right interface was requested, bump the ref count,
149 |              * set the ppv parameter equal to the instance, and
150 |              * return good status.
151 |              */
152 |         ((QLGeneratorInterfaceStruct *)((QuickLookGeneratorPluginType *)thisInstance)->conduitInterface)->GenerateThumbnailForURL = GenerateThumbnailForURL;
153 |         ((QLGeneratorInterfaceStruct *)((QuickLookGeneratorPluginType *)thisInstance)->conduitInterface)->CancelThumbnailGeneration = CancelThumbnailGeneration;
154 |         ((QLGeneratorInterfaceStruct *)((QuickLookGeneratorPluginType *)thisInstance)->conduitInterface)->GeneratePreviewForURL = GeneratePreviewForURL;
155 |         ((QLGeneratorInterfaceStruct *)((QuickLookGeneratorPluginType *)thisInstance)->conduitInterface)->CancelPreviewGeneration = CancelPreviewGeneration;
156 |         ((QLGeneratorInterfaceStruct *)((QuickLookGeneratorPluginType*)thisInstance)->conduitInterface)->AddRef(thisInstance);
157 |         *ppv = thisInstance;
158 |         CFRelease(interfaceID);
159 |         return S_OK;
160 |     }else{
161 |         /* Requested interface unknown, bail with error. */
162 |         *ppv = NULL;
163 |         CFRelease(interfaceID);
164 |         return E_NOINTERFACE;
165 |     }
166 | }
167 | 
168 | // -----------------------------------------------------------------------------
169 | // QuickLookGeneratorPluginAddRef
170 | // -----------------------------------------------------------------------------
171 | //  Implementation of reference counting for this type. Whenever an interface
172 | //  is requested, bump the refCount for the instance. NOTE: returning the
173 | //  refcount is a convention but is not required so don't rely on it.
174 | //
175 | ULONG QuickLookGeneratorPluginAddRef(void *thisInstance)
176 | {
177 |     ((QuickLookGeneratorPluginType *)thisInstance )->refCount += 1;
178 |     return ((QuickLookGeneratorPluginType*) thisInstance)->refCount;
179 | }
180 | 
181 | // -----------------------------------------------------------------------------
182 | // QuickLookGeneratorPluginRelease
183 | // -----------------------------------------------------------------------------
184 | //  When an interface is released, decrement the refCount.
185 | //  If the refCount goes to zero, deallocate the instance.
186 | //
187 | ULONG QuickLookGeneratorPluginRelease(void *thisInstance)
188 | {
189 |     ((QuickLookGeneratorPluginType*)thisInstance)->refCount -= 1;
190 |     if (((QuickLookGeneratorPluginType*)thisInstance)->refCount == 0){
191 |         DeallocQuickLookGeneratorPluginType((QuickLookGeneratorPluginType*)thisInstance );
192 |         return 0;
193 |     }else{
194 |         return ((QuickLookGeneratorPluginType*) thisInstance )->refCount;
195 |     }
196 | }
197 | 
198 | // -----------------------------------------------------------------------------
199 | //  QuickLookGeneratorPluginFactory
200 | // -----------------------------------------------------------------------------
201 | void *QuickLookGeneratorPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID)
202 | {
203 |     QuickLookGeneratorPluginType *result;
204 |     CFUUIDRef                 uuid;
205 | 
206 |         /* If correct type is being requested, allocate an
207 |          * instance of kQLGeneratorTypeID and return the IUnknown interface.
208 |          */
209 |     if (CFEqual(typeID,kQLGeneratorTypeID)){
210 |         uuid = CFUUIDCreateFromString(kCFAllocatorDefault,CFSTR(PLUGIN_ID));
211 |         result = AllocQuickLookGeneratorPluginType(uuid);
212 |         CFRelease(uuid);
213 |         return result;
214 |     }
215 |         /* If the requested type is incorrect, return NULL. */
216 |     return NULL;
217 | }
218 | 
219 | 


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/readme.md:
--------------------------------------------------------------------------------
 1 | # Java Class Quick Look
 2 | This is a Quick Look plugin that lets you preview Java `.class` files as bytecode. It uses the `javap -c` command.
 3 | 
 4 | ![](docs/readme-example.png)
 5 | 
 6 | ## Requirements
 7 | * macOS
 8 | * Java installed
 9 | 
10 | ## Install
11 | Compile the target and copy the binary to either `/Library/QuickLook` or `~/Library/QuickLook`.
12 | 


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